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package br.com.munif.util;

import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;

/**
 *
 * @author Munif
 */
@WebFilter(filterName = "FiltroEntityManager", urlPatterns = {"/*"})
public class FiltroEntityManager implements Filter {

    private static final boolean debug = true;
    // The filter configuration object we are associated with.  If
    // this value is null, this filter instance is not currently
    // configured. 
    private FilterConfig filterConfig = null;

    public FiltroEntityManager() {
    }

    /**
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     * @param chain The filter chain we are processing
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
     */
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain)
            throws IOException, ServletException {
//        Locale ptBr = new Locale("pt", "BR");
//        Locale.setDefault(ptBr);
        request.setCharacterEncoding("UTF-8");
        Throwable problem = null;
        try {
            DadosAuditoria dadosAuditoria = new DadosAuditoria();
            //TODO Obter os dados aqui do request
            request.getRemoteAddr();
            dadosAuditoria.setIp(request.getRemoteAddr());
            HttpServletRequest hsq = (HttpServletRequest) request;
            dadosAuditoria.setUsuario(hsq.getUserPrincipal()!=null?hsq.getUserPrincipal().getName():"Não logado");
            Persistencia.getTlda().set(dadosAuditoria);
            EntityManagerFactory emf = Persistencia.getInstancia().getEmf();
            EntityManager entityManager = emf.createEntityManager();
            Persistencia.getTlem().set(entityManager);
            entityManager.getTransaction().begin();
            chain.doFilter(request, response);
            if (entityManager.getTransaction().isActive()) {
                entityManager.getTransaction().commit();
            }
            entityManager.close();
        } catch (Throwable t) {
            t.printStackTrace();
            if (Persistencia.getTlem().get().getTransaction().isActive()) {
                Persistencia.getTlem().get().getTransaction().rollback();
            }
            Persistencia.getTlem().get().close();
            // If an exception is thrown somewhere down the filter chain,
            // we still want to execute our after processing, and then
            // rethrow the problem after that.
            problem = t;
        }

        // If there was a problem, we want to rethrow it if it is
        // a known type, otherwise log it.
        if (problem != null) {
            if (problem instanceof ServletException) {
                throw (ServletException) problem;
            }
            if (problem instanceof IOException) {
                throw (IOException) problem;
            }
            sendProcessingError(problem, response);
        }
    }

    /**
     * Return the filter configuration object for this filter.
     */
    public FilterConfig getFilterConfig() {
        return (this.filterConfig);
    }

    /**
     * Set the filter configuration object for this filter.
     *
     * @param filterConfig The filter configuration object
     */
    public void setFilterConfig(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }

    /**
     * Destroy method for this filter
     */
    public void destroy() {
    }

    /**
     * Init method for this filter
     */
    public void init(FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
        if (filterConfig != null) {
            if (debug) {
                log("FiltroEntityManager:Initializing filter");
            }
        }
    }

    /**
     * Return a String representation of this object.
     */
    @Override
    public String toString() {
        if (filterConfig == null) {
            return ("FiltroEntityManager()");
        }
        StringBuffer sb = new StringBuffer("FiltroEntityManager(");
        sb.append(filterConfig);
        sb.append(")");
        return (sb.toString());
    }

    private void sendProcessingError(Throwable t, ServletResponse response) {
        String stackTrace = getStackTrace(t);

        if (stackTrace != null && !stackTrace.equals("")) {
            try {
                response.setContentType("text/html");
                PrintStream ps = new PrintStream(response.getOutputStream());
                PrintWriter pw = new PrintWriter(ps);
                pw.print("<html>\n<head>\n<title>Problemas</title>\n</head>\n<body>\n"); //NOI18N

                // PENDING! Localize this for next official release
                pw.print("<h1>Entre em contato conosco</h1>\n<pre>\n");
                pw.print(stackTrace);
                pw.print("</pre></body>\n</html>"); //NOI18N
                pw.close();
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else {
            try {
                PrintStream ps = new PrintStream(response.getOutputStream());
                t.printStackTrace(ps);
                ps.close();
                response.getOutputStream().close();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

    public static String getStackTrace(Throwable t) {
        String stackTrace = null;
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            t.printStackTrace(pw);
            pw.close();
            sw.close();
            stackTrace = sw.getBuffer().toString();
        } catch (Exception ex) {
        }
        return stackTrace;
    }

    public void log(String msg) {
        filterConfig.getServletContext().log(msg);
    }
}
